I started when I was 14 or so... I'd just started getting into 60s bands (The Beatles and the Monkees, to be specific), and once I started watching the Monkees TV show, I started asking "what if?" I've always had a pretty active imagination, so really, it was only a matter of time before I put some of these thoughts to paper. :)

Although... I don't know if it counts as fanfic, but when I was 12, I wrote a story for school that was shamelessly based off of the concepts found in the Redwall books. All OCs and different settings, though.

Unrelated: do you happen to speak any other languages besides English?